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Commit 5686f9c3 authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Implement a real set_perf_counter_pending(). 



When the perf counter subsystem needs to reschedule work out
from an NMI, it invokes set_perf_counter_pending().

This triggers a non-NMI irq which should invoke
perf_counter_do_pending().

Currently this won't trigger because sparc64 won't trigger
the perf counter subsystem from NMIs, but when the HW counter
support is added it will.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2d0740c4

arch/sparc/include/asm/perf_counter.h

+1 −1
Original line number Diff line number Diff line 
#ifndef __ASM_SPARC_PERF_COUNTER_H

#define __ASM_SPARC_PERF_COUNTER_H



static inline void set_perf_counter_pending(void) { }

extern void set_perf_counter_pending(void);



#define	PERF_COUNTER_INDEX_OFFSET	0

arch/sparc/kernel/pcr.c

+13 −1
Original line number Diff line number Diff line
@@ -7,6 +7,8 @@ 
#include <linux/init.h>

#include <linux/irq.h>



#include <linux/perf_counter.h>



#include <asm/pil.h>

#include <asm/pcr.h>

#include <asm/nmi.h>
@@ -34,10 +36,20 @@ unsigned int picl_shift; 
 */

void deferred_pcr_work_irq(int irq, struct pt_regs *regs)

{

	struct pt_regs *old_regs;



	clear_softint(1 << PIL_DEFERRED_PCR_WORK);



	old_regs = set_irq_regs(regs);

	irq_enter();

#ifdef CONFIG_PERF_COUNTERS

	perf_counter_do_pending();

#endif

	irq_exit();

	set_irq_regs(old_regs);

}



void schedule_deferred_pcr_work(void)

void set_perf_counter_pending(void)

{

	set_softint(1 << PIL_DEFERRED_PCR_WORK);

}